Lock



1961 F. A. BROWNING 2,995,395

LOCK

Filed Nov. 20, 1958 I0 39 38 33 I9 35 I7 39 38 INVENTOR /ZPOn A gd F/G4r ATTORNEY United States Patent Ofice 2,995,395 LOCK Frank A. Browning,310 W. 95th St, New York 25, NY. Filed Nov. 20, 1958, Ser. No. 775,172 1Claim. (Cl. 292-1169) This invention comprises novel and useful improvements in a lock.

The principal object of this invention resides in the provision of alock which cannot be opened by unauthorized persons using an instrument,tool or the like, but which must be opened from the outside with a keyand from the inside with the hand knob.

An important feature of the invention resides in the provision of a lockthat cannot be forced open except in such a manner as to break the lockand disfigure the door frame so that the possibility of burglars orother unauthorized persons entering a dwelling or other build: ing isprevented.

A further important object of the present invention is to provide a lockwhich is ruggedly constructed so that it will not readily get out of useand which can be constructed or manufactured with a minimum amount ofcost and effort.

These, together with various ancillary objects and features of theinvention which will later become appar: ent as the followingdescription proceeds, are attained by this device, a preferredembodiment of which has been illustrated by way of example only in theaccompanying drawings, wherein:

FIGURE 1 is a perspective view of the lock constructed according to thepresent invention;

FIGURE 2 is a plan view of the lock with the cover plate removed;

FIGURE 3 is a perspective view illustrating the secondary bolt;

FIGURE 4 is a view illustrating the spring member; and

FIGURE 5 is a sectional view taken on the line 5-5 of FIGURE 2.

Referring in detail to the drawings, the numeral 1 0 indicates the lockof the present invention which is shown to comprise a hollow housingthat is indicated generally by the numeral 11. The housing 11 includes aback wall 12 and an end wall 13, and the end wall 13 is provided with aslot 14.

The numeral 15 indicates a main bolt which is mounted for slidingmovement through the slot 14, and arranged contiguous to the main bolt15 is a secondary bolt 16. The numeral 17 indicates a return springwhich is connected to the secondary bolt 16. Thus, one end of the spring17 is anchored to the housing as at 18, while the other end of thespring 17 is connected to a pin 19 on the bolt 16.

Extending inwardly from the main bolt 15 and secured thereto or formedintegral therewith is a pair of spaced parallel cylindrical rods or bars20. A shoe 21 is mounted on the inner end of each rod 20, and the shoes21 are mounted for movement into and out of engagement with lugs 22 thatare secured Within the housing 11. The numeral 23 indicates a stationarybracket that is also secured within the housing 11, and the rods 20extend through the bracket 23. The numerals 24 designate coil springswhich are cireumposed on the rods 20, and the coil springs 24 abut thebracket 23.

Extending inwardly from the main bolt 15 is a shank 25 which has atooth'26 thereon. A pin 27 also extends inwardly from the main bolt 15.

As shown in FIGURE 3 for example, the secondary bolt 16 is provided witha cutout 29 that defines a shoulder Patented Aug. 8, 1961 30, and theshoulder 30 is provided with a flat surface 31 and an inclined surface32.

In FIGS. 2 and 5 the stud 39 is threaded into the reinforced plateadjacent to the handturning knob shown in FIG. 1. This stud 39 can becast in the frame; the plate 33 is pivoted on this stud 39 as is shownin FIG. 5; the spring 38 is pivoted at the top of this stud 39, so as tohold it in place; its pressure is between the frame wall and the plateat the two extremities of the spring, as shown in FIG. 2. The plate 33is provided on one end thereof with a pair of spaced apart fingers 35and 36 that define a slot 37 therebetween, and a spring member 38 isconnected to the plate 33 as at 39. The plate 33 is further providedwith a beveled lip 40, as shown in the drawings.

The numeral 41 indicates a bushing which is rotatably connected to thehousing 11, and arms 42 are secured to the bushing 41. A cam 43 issecured to the arms 42 or formed integral therewith, and the cam 43 isadapted to selectively engage the beveled lip 40 on the plate 33. Thenumeral 44 indicates the hand knob for the lock.

From the foregoing, it is apparent that there has been provided animproved lock, and it is to be noted that the spring 38 forces thesafety locking device closed.

According to the present invention, there has been pro vided aninexpensive attachable door snap lock of the Yale tumbler key type whichis converted by means of a second bolt 16 into one which cannot beforced open by pressing on the bolt with an instrument or tool, butwhich must be opened from the outside with a key and from the insidewith the hand knob.

The original bolt has been changed very little, and it has its exteriorand interior the same, and there is provided the two spring carryingbars 20 which have the shoes 21 on the inner end thereof. A stud isarranged on the inside or back of the bronze section and the shoes 21have been moved further back to the rear and in addition a small studhas been arranged in the side adjacentto the second bolt 16.

The second bolt 16 has been added which is an important safety featureand which has the same configuration or cross-section as the bolt 15,but it is of less thickness than the bolt 15. The bolt 16 is carried onan inde-. pendent shaft within the lock and there is provided a spring17 for forcing the bolt 16 forward under tension at the proper time. Onthe side next to the original bolt, in such a manner as to engage thestud on the original bolt, a slot has been cut in which the stud or pinslides so that when the locking bolt is forward, the second bolt 16 mayremain within the lock. However, when both are forward the original boltcarries by the stud, the second bolt 16 back to the unlocked position.This feature may be eliminated, but it serves as an additional safetyfactor.

The secondary or added bolt 16 is preferably thick enough to permit forslight discrepancies and door sag, so that it will not drop into theaperture on the door frame section, but it is held within the lock whenthe door is shut. It can be made flat ended and fiat faced so as to lieunder the original bolt and not beside it. With this arrangement, whenthe door is shut, the added bolt is held within the lock by the flushrear part of the door frame section.

The key turning and knob turning members which engage the bolt shoes 21,have added cams such as the cams 43 and 42 and these can be properlyfabricated during the manufacture of the device. Furthermore, studs havebeen added to prevent these members from turning both ways, and they canwork most efficiently by turning in one direction only.

Furthermore, a cam and trigger or cam turning and bolt stopping leverhas been pivoted and the safety bolt 16 has been cut so as to permit thestopping part of the pivoted lever to slide through the shaft of thesecond bolt and behind the stopping stud of the first bolt when the lockis in its locked position and the second bolt is held within the lock.It is to be noted that when both bolts are forward and the door is open,the stopping mechanism has been pushed out of its slot and is held insuch a position that both bolts are permitted forward. When the lockengages the door frame section, both bolts 16 and 15 are pushed backtogether, but only the first bolt falls into its aperture in the framesection, and the second bolt is held out and the safety is on.

Since it is not practical to begin to lift the pivoted section by itsshoe and the cam at the same time that the bolt begins to be Withdrawn,the shoes 21 have been set back and rest on studs set in the frame.Thus, it will be noted that the cam begins to lift the lever shoe andclears the stopping section before the turning member begins to withdrawthe bolt. A ball bearing centering device and a V in the knob turningsection are also provided for centering the knob turning member which isnot centered by the bolt shoes as was done previously. No 'suchcentering is necessary for the key turning, since that centers when thekey is withdrawn. Furthermore, when either turning member is operated,that member immediately lifts the safety locking lever from behind thebolt stud and a short turn further begins withdrawal of the bolt itself.

In use, it is to be noted that the locking lever is in position as longas the bolts are properlyengaged and it does not in any way impede theoperation of the lock when functioning properly. Furthermore, the'lockcan'- not be forced except with a very heavy instrument and this wouldbe impossible without breaking the lock and disfiguring the door frame,which is an important advantage.

The parts can be made of any suitable material and in different shapesor sizes.

From the foregoing, it is thought that the construction and operation ofthe device will be readily understood. Obviously the dimensions can bevaried, and it will thus be seen that there has been provided a lockwhich'will accomplish the desired objects and advantages in a highlyeflicient manner.

In view of the foregoing description taken in conjunction with theaccompanying drawings, it is believed that a clear understanding of theconstruction, operation and advantages of the device will bequiteapparent to those skilled in this art. A more detailed descriptionis accordingly deemed unnecessary.

It is to be understood however that even though there is herein shownand described a preferred embodiment of the invention the same issusceptible to certain changes fully comprehended by the spirit of theinvention as herein described and the scope of the appended claim.

Having described the invention, what is new is:

In a device of the character described, a hollow housing including aback Wall and an end wall provided with a slot, a main bolt mounted forsliding movement in said hollow housing, a movable secondary boltarranged in close adjacent relationship with respect to said main bolt,said secondary bolt having the same general cross-section as said mainbolt but being of less thickness than said main bolt, said main bolt andsecondary bolt projecting through said slot in said end wall, a coilspring operative 1y connected to said secondary bolt and defining areturn spring, one end of the return spring being anchored to thehousing while the other end of the return spring is connected to a pinon the secondary bolt, a pair of spaced parallel rods secured to saidmain bolt and extending inwardly therefrom, shoes on the inner ends ofsaid rods, lugs secured within said housing for engagement by saidshoes, a stationary bracket secured within said housing, said rodsextending through said bracket, coil springs circumposed on said rodsand abutting said bracket, a shank extending-inwardly from said mainbolt, a tooth on said shank, a pin extending inwardly from said mainbolt, a rectangular shaft extending inwardly from said secondary bolt,said secondary bolt being provided with a cutout defining a shoulderhaving a fiat surface and an inclined surface, a stud mounted in saidhousing, a plate arranged in said housing and said stud having saidplate pivotally connected thereto, a pair of spaced apart fingers on oneend of said plate defining a slot therebetween for receiving theshoulder of said secondary bolt, a spring member connected to saidplate, a beveled lip integral with said plate, a bushing rotatablyconnected to said housing, arms connected to said bushing, and a camconnected to said arms for selectively engaging the beveled lip on theplate.

claimed as References Cited in the file of this patent UNITED STATESPATENTS 2,232,937 Brauning et al Feb. 25, 1941 2,379,810 Ledin et a l.July 3, 1945 2,558,509 Cerf June 26, 1951 2,648,560 Quigley et a1 Aug.11, 1953 2,656,207 Russell et al. Oct. 20, 1954

